S avfr-clam p



(No Model.)

G. GOFPIN.

SAW CLAMP.

Patented June 9, 1885. l

, WITNEEE-i INVENTQF- Srarhs i il GALEN OOFFIN, OF BOSTON, MASSACHUSETTS.

SAWWCLAMP.

QIPECIFIGATION forming part of Letters Patent No. 319,455, dated June 9, 1885.

(No model.)

To all whom it may concern:

Be it known that I, GALEN CorrrN, of Boston, in the county of Middlesex and State of Massachusetts, `have invented a new and useful Improvement in Saw-Clamps, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention consists of an improvement in what is known as a clamp or a holding device for ling saws, and is especially adapted to circular saws; and it consists of two upright pieces or clamping-jaws, between which the saw is clamped, and a pin passing through the center hole of the saw, on which it revolves as it is filed, together with a third upright bar, from one edge of which project several wedge-shaped pieces, which serve, in connection with the central pin, to draw the two clamping-jaws together, thereby holding the saw firmly in position for ling.

To enable those skilled in the art to make and use my improved saw-clamps, I will proceed to describe the same with reference to the drawings, similar letters referring to simi` lar parts.

Figure l represents a front view of my invention. Fig. 2 is a side View of the same in section as it would appear when fastened to a common bench. Fig. 3 represents a crosssection through the center of a circular saw when in position for ling. Fig. 4 represents a cross-section near thelower end.

In the drawings, Fig. 1, AB are the two upright clamps between which the saw is held. l

C is an upright bar swinging from a fulerum, as seen at f in Figs. 2 and 3, and having a series of wedge-shaped pieces, as c c c c c, projecting from one edge, and also a raised piece near the upper end, for convenience of driving the top end forward or back when clamping or releasing the saw. a is a long slot running up and down for any desired part of the length ofthe clamp or jaw A.

b b b b I) are holes in the clamp B, placed at suitable distances apart to accommodate the different sizes of saws. These holes are somewhat less in width than the diameter of the pin D, the front end of which is cut away correspondingly, to insure its projecting end being in the right position to enable one of the `ly to lighten them.

wedge-pieces c c c c c to pass through hole d in the pin D.

The clamping jaws A B may be made of either wood or metal, but are herein represented as if made of east-iron, and have several holes cut through each, as m m m m m, mere- The clamp-piece A is also provided with screw-holes, ash lr., to fasten the same to a-bench. There are also two holes near the lower end, passing through both A and B, for two small bolts or screws, as i t', which serve to hold the two clampingjaws rmly together.

The swinging bar G is provided with a round piece projecting from the back side of its lower end, which passes through the hole g in the clamp-piece A, whileit also rests in the pocket-shaped cavity or bracket, as E, in the front jaw, B, thereby .holding its lower end firmly in position, while the upper end is allowed to swing freely back and forth, but cannot be removed from its place without iirst removing the bolts or screws t t.

To use my improved saw-clamp, I take the clamp-piece B and insert the lower end of the swinging bar C in the pocket, as E. I then place both uponthe piece A, so that the pin f ts into the hole g,- then, holding the two jaws in their proper position, put in the two bolts or screws t' i, screwing them iirmly together with a screw-driver. The whole is then secured to a bench by means of common woodscrews. The pin D is then taken in one hand and placed in the slot a, and with the other hand place the saw between the clamps A B, while the pin D is then passed through the saw and one of the holes b Z b b b, according to size of the saw, and the corresponding wedgepiece, c c c c o, is driven through the hole cl in the pin D by a blow with the hand, where the saw is held in position and freely revolved upon the pin D until filed, when it is instantly released by another blow with hand or handle of the tile.

The construction. of the pin D can be varied by dispensing with the hole d, and turning the corresponding part to a smaller diameter, in which case the wedge-pieces would be double or forked, and the holes in the j'aw B would be round 5 but as it is sometimes troublesome IOO its several wedge-shaped projections; but the form shown and described will be found mueh more convenient.

II" desired, long wood-screws may be used instead of the bolts t' fi, iuwhich lcase the nuts shown on the bolts would not be wanted, as

. the screws would pass through both A and B into the bench, securing the whole in position for use.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination of the jaw A, provided with slot a, the j aw B, provided with holes b b, `the pin D, and the wedge C, arranged to oooperaterwith each other to force said jaws toward'each other, substantially as described.

2. The combination of the jaw A, provided with the hole g, the jaw B, providedwith the pocket E, the pin D, the swinging Wedge-carrier C, provided with pin f, and the bolts or screws i i., all arranged and adapted to operate substantially as and for thepurpose set forth.

B.` In combination with the jaw A and the jaw B, provided with holes b b, and secured together at their lower ends, a single pin, D, adapted to be interchangeably inserted in either of the holes b b, and a series of wedges. c c, attached to a common carrier, all arranged and adapted to operate substantially as and for the purpose described.

' In testimony whereof I have signed my name to this specification in the presence of two sub soribing witnesses.

GALEN COFFIN.

Vitnesses: v

HELEN M. FEEGAN,

, FRANK G. PARKER. 

